Utility knife



FIG. 1 is a left elevation view of a utility knife showing my new design;

FIG. 2 is a right elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left perspective view thereof;

FIG. 8 is a left perspective view thereof, in the open configuration; and,

FIG. 9 is a left perspective view thereof, in the open configuration and with the blade guard removed and the blade exposed. 

CLAIM The ornamental design for a utility knife, as shown and described. 